RT Journal Article SR Electronic T1 Morphological and Chemical Connective Tissue Changes in Fibrositic Muscles JF Annals of the Rheumatic Diseases JO Ann Rheum Dis FD BMJ Publishing Group Ltd and European League Against Rheumatism SP 438 OP 440 DO 10.1136/ard.16.4.438 VO 16 IS 4 A1 P. Brendstrup A1 K. Jespersen A1 G. Asboe-Hansen YR 1957 UL http://ard.bmj.com/content/16/4/438.abstract AB